Monitoring in non-mating disruption orchards provides an estimate of the date when adult moths first emerge in the spring, allows for the calculation of degree days, and informs the timing for insecticide applications. Monitoring for codling moth adults should begin in mid-May, using a sticky trap with a female sex-pheromone lure. Set out monitoring traps within the tree canopy (6 to 9 feet high in full-size trees, or around head height in high density plantings). Place one trap for approximately every five acres baited with a 1-mg strength, commercially available pheromone lure. These traps should be checked daily from bloom until first trap catch, and every 1 to 2 weeks from first trap catch until harvest. When checking traps, it is important to carefully inspect the moths found in the trap, as the trap may attract other closely related and similar-looking species, such as the maple twig borer.